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(No Model.)

flu/e71 an Patented Sept. 16, 1884.

mheisses' HERRMANN STANGE, OF DBESDEN, SAXONY, GERMANY.

ROTARY DOUBLE BEARING WITH PERIODICALLY ALTERNATE ACTION.

SPECIFICATION forming part of Letters Patent No. 305,351, datedSeptember 16, 1884.

Application filed May 9, 1884.

To all whom it may concern.-

Be it known that I, HERRMANN STANGE, of the city of Dresden, in theKingdom of Saxony, and German Empire, have invented certain new anduseful Improvements in Rotary Double Bearings with PeriodicallyAlternate Action, of which the following is a specification.

This invention relates to improvements in rotary double bearings withperiodically alternate action, which are admirably adapted foremployment in weighing-machines or other scientific or industrialmeasuring apparatus. The chief novelty consists in the arrangement of abearingwith free motion in the one part, and whereby both parts actalteruately-that is to say, while the one bearing is in action the otherremains inactive, and vice versaand whereby the outer bearing receivesits rotary motion from the inner bearing by means of the free movementof the inner bearing in the outer by the dislocation of the center ofgravity.

Figure 1 is an elevation showing the inner bearing in a verticalposition in the outer bearing. Fig. 2 is a section on the line a 13 inFig. 1. Fig. 3 is an elevation showing the inner bearing, Z), moved tothe right, so that a second point of the same comes in contact with theinner surface of the ring screwed to the outer bearing. Fig. 4 is asection on the line V S in Fig. 3.

The star-like bearing 1), with four arms, is-

fixed on the shaft a, and arranged in the hol low bearing 0. Theinterior surface consists of a pentagon or more sided polygon, withsides of equal size. The size of the inner hearing, 0, is so chosen thatthe axis a lies beneath the axis 01 of the polygonal bearing 0 in suchmanner that two adjacent points or-knifeedges of the star-formedbearing 1) continuously gear into two corners of the polygonal bearing0. If the hearing 1) stands in the position shown (No model.)

| in Fig. 1, the same can be moved without moving the bearing 0. Thisfree movement can be employed as hearing for the weighingbeam in rotaryweighing-machines in order to attain an exact and frictionless weighing.The burden carried by the bearing 1) produces in the position shown inFig. 1 pressure on the axle of the bearings 0 alone. If the bearing 7)is now moved to the one or the other side, the next knifeedge will presson the corresponding corner f, the polygon and the center of gravitymoved to the side of the axis of the bearing a, lateral pressure appliedto the same, and consequently a rotation of the said hearing 0 produced,Fig. 2. This movement ceases in the moment when the axis a attains alike position to the axis (1, whereupon the movement described above isrepeated. The exsame can be arranged in suitable bearings; but, in orderto avoid excessive friction, the axis .d is arranged in the center ofthe bearing.

\Vhat I claim as my invention is The double bearing consisting of thestarformed bearing 1) and the polygon 0, whereby th e inner hearing, I),bears frictionless by means of one of its knife-edges in a correspondingcorner or junction of two sides of the polygonal, and whereby this freebearing produces a periodical alteration in the position of the axis ato the axis d, in order to produce a lim ited rotation of the outerlayer by the dislocation of the'center of gravity, substantially asdescribed.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

HERRMANN STANGE.

Witnesses:

Or'ro WVoLvF, ARTHUR WILLIAM Vorer.

terior form of the bearing 0 is round, and the

